
- Human muscle system | Functions, Diagram, & Facts | Britannica- Sep 26, 2025 · Human muscle system, the muscles of the human body that work the skeletal system, that are under voluntary control, and that are concerned with movement, posture, and … 
- Human body | Organs, Systems, Structure, Diagram, & Facts- Sep 24, 2025 · The human body Vintage anatomy charts of the human body showing the skeletal and muscle systems. 
- Human body systems | Muscle, Skeletal, Respiratory, Circulatory ...- Each of the major systems of the body is essential to the survival of the human organism, and each serves as a critical companion to the others. The muscle and skeletal systems, for … 
- Cardiac muscle | Definition, Function, & Structure | Britannica- Cardiac muscle possesses contractile units known as sarcomeres and exhibits rhythmic contractions. The rhythmic contractions are regulated by the sinoatrial node of the heart and … 
- Human skeleton | Parts, Functions, Diagram, & Facts | Britannica- Oct 11, 2025 · What are the primary functions of the human skeleton? The primary functions of the human skeleton are support, protection, and motion. Support is the most primitive and … 
- Human muscle system - Abdominal Muscles, Anatomy, Function- Sep 26, 2025 · Human muscle system - Abdominal Muscles, Anatomy, Function: There are three muscular layers of the abdominal wall, with a fourth layer in the middle anterior region. 
- Human muscle system - Evolution, Anatomy, Function | Britannica- Sep 26, 2025 · Human muscle system - Evolution, Anatomy, Function: The arrangement of striated muscle in modern humans conforms to the basic plan seen in all pronograde … 
- Muscle - Types, Structure, Function | Britannica- Oct 10, 2025 · Muscle - Types, Structure, Function: Muscle fibres differ from species to species of animal and between parts of the same animal. Apart from the distinction between voluntary … 
- Heart | Structure, Function, Diagram, Anatomy, & Facts | Britannica- Oct 21, 2025 · Where is the heart located in the human body? In humans, the heart is situated between the two lungs and slightly to the left of center, behind the breastbone. It rests on the … 
- Muscle | Systems, Types, Tissue, & Facts | Britannica- Oct 10, 2025 · Muscle, contractile tissue found in animals, the function of which is to produce motion. Muscle cells fuel their action by converting chemical energy in the form of adenosine …